472 C. Schuchert — Notes on Arctic Paleozoic Fossils. 



Silliman's Fossil Mount, Frobisher Bay. 



Schuchert in 1900 described the fauna of seventy-two species 

 occurring at this interesting locality. None of it had, however, 

 been collected stratigraphically, and as most of the widely dis- 

 tributed species agreed with identical or similar forms occur- 

 ring in the Galena formation of Minnesota and Iowa (57 per 

 cent) he concluded that all the fossils came from strata of about 

 Galena-Trenton time. On the other hand, the many corals 

 found at Silliman's Fossil Mount he interpreted as " an early 

 introduction of Upper Silurian genera." Since then he has 

 collected the same corals at a much higher horizon, in the 

 Richmond formation on Anticosti Island, and has seen them as 

 well at other places in this country and in Norway and 

 Esthonia, always above the Galena-Trenton equivalents. It 

 therefore follows that the Richmond must also be present at 

 the head of Frobisher Bay. 



The above mentioned fauna is kept in the IT. S. National 

 Museum and has been restudied by Bassler (1911 : 32-36). 

 The latter writes : " There is just as much if not more reason 

 for believing that the Black River, Trenton and Richmond 

 rocks are actually present in the section as for assuming that 

 only Trenton strata occur. . . The Richmond age of the corals 

 was further evidenced by the fact that two very characteristic 

 brachiopods, a variety of Platystrojphia acutilirata and of 

 Plectambonites sericeus came to light when I carefully searched 

 a fragment of limestone adhering to one of the corals. This 

 particular variety of Plectambonites is highly characteristic of 

 the Richmond in America and Europe. It is distinguished by 

 the occurrence of small teeth along the edge of the cardinal 

 area of the dorsal valve." 



In conclusion, the writer agrees with Bassler that there are 

 at least two Ordovician horizons represented at Silliman's 

 Fossil Mount, namely, (1) a lower one containing the bulk of 

 the fauna and equivalent to the Lower Trenton of Minnesota, 

 and (2) an upper fauna here essentially made up of corals and 

 the equivalent of that of Middle Richmond time. It is prob- 

 able that the Black River equivalent is also present at the 

 Mount, though less well exposed and on or below the debris- 

 covered lower slope of the Mount. 



Southampton Island, Hudson Bay. 



Doctor A. P. Low on his first expedition in 1903-1904 col- 

 lected fossils on Southampton Island along " the southern 

 half of the west coast of the island" (1906 : 211). Two hori- 

 zons are clearly indicated, as follows : 



